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The ability of Hydra and Planaria to grow into a full organism from a body piece is called:
Answer & Solution
Correct answer: A.
1. Regeneration is the formation of a complete organism from a body part.
2. In Hydra and Planaria, specialised cells proliferate from the cut piece.
3. These cells differentiate into all required tissues, completing the organism.
_Source: NCERT Class 10 Science, Ch 7 "How do Organisms Reproduce", §7.2.3_
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